says it interviewed tamerlan tsarnaev in 2011 after being told by a foreign government, reportedly russia, he had become a follower of riradical islam. they found no evidence of terrorist activity at that time. did the chech anyian brothers act alone or was it a broughter plan with coconspiracies in the u.s. or overseas? wayne simmons, a former c.i.a. analyst and joins us now with some insight. thank you for coming in today. >> always a pleasure. >> i want to ask you about this. the way that the bombs they use have had been described, you know, many law enforcement sources said they were too sophisticated for somebody who was going to google and throw something together that the brothers had to have training at some point. for what they are accused of doing. what do you make of that? >> all of us, first of all, those agree that nothing today is 100% certain. that is where we need to start. if i had to make a guess, i would remind guys like me that 12 years ago, 13 years ago the chechens were in afghanistan trying to build the same kind of bombs, using propane tanks. and they were blowing